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Considering the characteristics of steel slag, the effective relative density of steel slag was measured by the impregnation method. By the volume substitution method, the asphalt mixtures with different steel slag content were prepared for replacing the coarse aggregates. According to the technical requirements of the ultra-thin friction course, the road performance and the function characteristics of the steel slag asphalt mixture were evaluated. The test results show that with the increasing of steel slag content, the performance indexes of dynamic stability, maximum tensile strain and tensile strength ratio of asphalt mixture are increased with latter decreasing. When the steel slag content is 50%, the comprehensive performance of asphalt mixture is the best. With the increasing of the placement time of test specimens, the high temperature performance index of the steel slag asphalt mixture is increased slightly, while the low temperature crack resistance index and water stability index are decreased. The skid resistance and abrasion resistance of asphalt mixture are significantly improved with the addition of steel slag. The impermeability of the mixture is reduced, while the water seepage coefficient values of several steel slag asphalt mixtures can still meet the requirements of the standard test methods of bitumen and bituminous mixtures for highway engineering (JTG E20—2011). [ABSTRACT FROM AUTHOR]

To improve the high temperature stability of asphalt pavement and alleviate the urban heat island effect, a color reflective asphalt pavement coating was developed. The amount of raw materials and the preparation process of coating were determined, and the cooling effects of color coating were tested and analyzed. The effect of coating on the surface function of pavement was tested, and the improvement measures were put forward. The results show that the cooling effect is the best when the volume ratio of TiO2 to film forming base is 2.8%. The cooling effect of the coating is improved with the increasing of color filler, while the cooling effect tends to be unchanged when the color filler is larger than a certain threshold. The volume ratios of color filler to film forming base are recommended from the economic and cooling effect with red of 2.7%, green of 2.6% and yellow of 3.2%. In order to improve the anti-slide performance and abrasion resistance of the coating, 0.48~0.50 kg·m-2 mechanical sand should be sprayed in the middle part of coating, and the light calcium carbonate with 30% coating quality should be added. [ABSTRACT FROM AUTHOR]